Italian

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Etymology

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From fortunato +‎ -issimo.

Adjective

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fortunatissimo (feminine fortunatissima, masculine plural fortunatissimi, feminine plural fortunatissime)

  1. superlative degree of fortunato (very lucky)

Latin

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Adjective

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fortūnātissimō

  1. dative/ablative masculine/neuter singular of fortūnātissimus